Iron Butterfly Bank Nifty: Setup, Payoff and Risk Guide
- August 25, 2026
- Posted by: Kunal Singla
- Category: Market
Bank Nifty level used in this article: Rs 57,762 (as of 21 Aug 2026). Next monthly (last Tuesday of the month) expiry: 25 August 2026 (Tuesday). Lot size 30. Weekly options on Bank Nifty were discontinued in November 2024 under SEBI’s one weekly index per exchange rule; only monthly contracts remain.
Quick Answer
The iron butterfly Bank Nifty combines a short at the money call and a short at the money put, at the same strike, with a long out of the money call and a long out of the money put as protective wings on either side, all on the same expiry. With Bank Nifty at Rs 57,762, the iron butterfly Bank Nifty collects a net credit at entry, which is the maximum profit, realised when the index closes exactly at the centre strike at expiry. Unlike a standard butterfly spread, which uses only calls or only puts, the iron butterfly Bank Nifty mixes both calls and puts, but the two structures produce a very similar defined risk payoff shape.
The this strategy can be thought of as a defined risk version of a short straddle: the short call and short put at the centre strike generate the bulk of the premium, similar to a short straddle, but the long wings on either side cap the otherwise unlimited risk that a naked short straddle would carry.
Because the short strikes in the iron butterfly Bank Nifty are both at the same at the money level, the position has a narrower profit zone than an iron condor, which separates its short strikes, but it typically offers a larger net credit for that reduced profit zone width.
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What Is the The position?
The iron butterfly Bank Nifty is a four leg options strategy using three strikes: a centre strike where both a call and a put are sold, and two outer strikes where a call and a put are bought as protection.
The four legs of the this trade are:
- Sell an at the money call at the centre strike
- Sell an at the money put at the same centre strike
- Buy an out of the money call above the centre strike, capping upside risk
- Buy an out of the money put below the centre strike, capping downside risk
The net credit collected from the two short options minus the cost of the two long options is the maximum profit for the iron butterfly Bank Nifty, realised if the index closes exactly at the centre strike. The maximum loss is the width between the centre strike and either wing, minus the net credit, multiplied by the lot size.
How Does the This options approach Work?
With Bank Nifty at Rs 57,762, an iron butterfly Bank Nifty might use 57,800 as the centre strike for both short options, with wings at 57,450 and 58,150. The position profits most if Bank Nifty stays very close to 57,800 through expiry, with the profit zone narrowing sharply as the index moves away from that centre point.
| Parameter | Details |
|---|---|
| Index | Bank Nifty (Nifty Bank) (NSE) |
| Expiry | Monthly only, last Tuesday of the month. Effective September 2025 (NSE index expiry swap). Weekly contracts discontinued November 2024. |
| Lot Size | 30 units (effective from January 2026 per NSE circular, reduced from 35) |
| Strategy Type | Neutral, pinned to centre strike, defined risk |
| Legs | 4 (short ATM call, short ATM put, long OTM call, long OTM put) |
| Max Profit | Net credit received at entry, times lot size (illustrative) |
| Max Loss | Wing width minus net credit, times lot size (illustrative) |
| Margin | Varies dynamically. Check live margin on your broker’s calculator before placing any order. |
The spread: Step by Step Setup
- Select the centre strike. With Bank Nifty at Rs 57,762, the ATM strike of approximately 57,800 is the common choice for both short legs of the iron butterfly Bank Nifty.
- Sell the ATM call and ATM put at the centre strike. Both legs of the this strategy should be placed together at the same strike and expiry.
- Select and buy the protective wings. An out of the money call above the centre strike and an out of the money put below it cap the risk on each side of the iron butterfly Bank Nifty. The wing distance determines both the maximum loss and the net credit received.
- Calculate the net credit, maximum profit, and maximum loss. For the the position, the net credit is the maximum profit, and the wing width minus the net credit is the maximum loss.
- Set an exit plan before confirming the order. Because the profit zone of the iron butterfly Bank Nifty is narrow, decide in advance whether to hold to expiry or take a partial profit if the index stays near the centre strike as expiry approaches.
Illustrative Payoff: Iron Butterfly Bank Nifty
Illustrative example for educational purposes only. Strikes and premiums are hypothetical and should not be interpreted as a trade recommendation.
Hypothetical setup: Sell 57,800 CE at Rs 130, sell 57,800 PE at Rs 125, buy 58,150 CE at Rs 40, buy 57,450 PE at Rs 38. Net credit: Rs 177 per unit. Lot size: 30 units. Wing width: 350 points.
| Bank Nifty at Expiry | P&L Per Lot (approx, Rs) | Outcome |
|---|---|---|
| At or below 57,450 | -5,190 | Max loss; long put wing caps downside |
| 57,623 (lower breakeven, approx) | 0 | Breakeven |
| 57,800 (centre strike) | +5,310 | Max profit |
| 57,977 (upper breakeven, approx) | 0 | Breakeven |
| At or above 58,150 | -5,190 | Max loss; long call wing caps upside |
The iron butterfly Bank Nifty payoff peaks sharply at the centre strike and declines on either side, reaching maximum loss once the index reaches either wing, similar in shape to a standard butterfly but constructed using both calls and puts rather than options of a single type.
Greeks for the Iron Butterfly Bank Nifty
Delta: The iron butterfly Bank Nifty starts near delta neutral at the centre strike, developing directional delta as the index moves toward either wing.
Gamma: The iron butterfly Bank Nifty carries negative gamma near the centre strike as expiry approaches, meaning the position becomes more sensitive to movement precisely where the trader wants the index to stay pinned.
Theta: Theta is generally positive for the iron butterfly Bank Nifty when the index is near the centre strike, since the two short options at that strike decay faster than the two long wing options.
Vega: The iron butterfly Bank Nifty is generally short vega near the centre strike, meaning a rise in implied volatility after entry tends to work against the position if the index is trading near that strike.
When the Iron Butterfly Bank Nifty May Be Considered
The iron butterfly Bank Nifty may be considered when a trader expects the index to stay very close to a specific level through expiry, often the current ATM level; wants a defined risk alternative to a short straddle; or is comfortable with a narrower profit zone in exchange for a larger net credit relative to a wider iron condor.
When NOT to Use the Iron Butterfly Bank Nifty
Consider avoiding the iron butterfly Bank Nifty when you have only a general rangebound view rather than a specific pinning level, in which case an iron condor’s wider profit zone may be more appropriate; when the index is likely to trend strongly; or when the wing strikes available do not offer an attractive net credit relative to the potential loss.
Risk Management
The iron butterfly Bank Nifty has defined risk limited to the wing width minus the net credit. Because the profit zone is narrow, many traders consider taking partial profits if the index approaches the centre strike before expiry, rather than holding for the theoretical maximum, which requires landing very close to that exact level.
Transaction Costs
The iron butterfly Bank Nifty involves four option legs, which can mean meaningful cumulative transaction costs relative to the net credit received. Brokerage, exchange transaction charges, STT, GST, SEBI charges, stamp duty, and bid ask spread impact across four legs should be weighed carefully.
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Iron Butterfly vs Other Bank Nifty Neutral Strategies
| Strategy | Short Strikes | Max Profit | Max Loss | Profit Zone | Complexity |
|---|---|---|---|---|---|
| Iron Butterfly | Same strike (ATM) | Defined (net credit, larger) | Defined (wing minus credit) | Narrow, at centre | Medium High |
| Iron Condor | Separated strikes | Defined (net credit, smaller) | Defined (spread minus credit) | Wider, between two short strikes | Medium |
| Short Straddle | Same strike (ATM), no wings | Defined (net credit, largest) | Unlimited | Narrow, at centre | High |
The iron butterfly Bank Nifty sits between the iron condor, which offers a wider but lower credit profit zone, and the short straddle, which offers the largest credit but carries unlimited risk without protective wings.
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Conclusion
The iron butterfly Bank Nifty offers a defined risk way to express a precise view that the index will stay near a specific level through expiry, combining a short straddle’s larger credit with the protection of long wings. Always verify current lot size (30 units from January 2026) and expiry schedule before executing any trade, and consult a SEBI registered investment advisor if you are new to multi leg options strategies.
Disclaimer: Data and figures in this article are sourced from publicly available information and may or may not be accurate. All examples are illustrative and hypothetical only. Please verify all data including contract specifications, lot sizes, and expiry schedules with the official NSE (nseindia.com) and BSE (bseindia.com) websites before making any investment decision. Investments in securities are subject to market risk. This content is for educational purposes only and is not investment advice by Univest (SEBI RA INH000013776).
Frequently Asked Questions
What is the iron butterfly Bank Nifty?
Ans. The iron butterfly Bank Nifty sells an ATM call and an ATM put at the same centre strike, and buys an OTM call and an OTM put as protective wings, all on the same expiry. Maximum profit occurs when the index closes exactly at the centre strike.
How does the iron butterfly Bank Nifty differ from a standard butterfly spread?
Ans. A standard butterfly spread uses only calls or only puts across three strikes. The iron butterfly Bank Nifty combines both calls and puts, selling at the centre strike and buying wings on both sides, though the resulting payoff shape is very similar.
What is the maximum loss in the iron butterfly Bank Nifty?
Ans. The maximum loss is the wing width minus the net credit received, multiplied by the lot size, occurring if the index closes at or beyond either wing strike at expiry.
What is the maximum profit in the iron butterfly Bank Nifty?
Ans. The maximum profit is the net credit received when all four legs are placed, multiplied by the lot size, realised only when the index closes exactly at the centre strike at expiry.
How does the iron butterfly Bank Nifty differ from an iron condor?
Ans. The iron condor separates its short call and short put strikes, creating a wider profit zone with a smaller credit. The iron butterfly Bank Nifty places both short options at the same centre strike, narrowing the profit zone but increasing the net credit collected.
What is the current lot size for Bank Nifty options?
Ans. The Bank Nifty lot size is 30 units effective from January 2026, reduced from 35. Always verify the current lot size on nseindia.com before placing any order.
Is the iron butterfly Bank Nifty suitable for beginners?
Ans. The iron butterfly Bank Nifty involves four legs and a narrow profit zone, making it better suited to traders with some prior options experience rather than complete beginners, though its defined risk makes it more approachable than a naked short straddle.
